Unlike many other tests, PCR tests can find evidence of disease in the earliest stages of infection. Other tests may miss early signs of disease because there aren’t enough viruses, bacteria, or other pathogens in the sample, or your body hasn’t had enough time to develop an antibody response.
Antibodies are proteins made by your immune system to attack foreign substances, such as viruses and bacteria. PCR tests can detect disease when there is only a very small amount of pathogens in your body.
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